Gnomonic projection
| a projection of the circles of the sphere, in which the point of sight is taken at the center of the sphere, and the principal plane is tangent to the surface of the sphere. |
See also: Gnomonic
| 单词 | gnomonic projection | ||
| 释义 | Gnomonic projection
See also: Gnomonic Gnomonic Projectiongnomonic projection[nō′män·ik prə′jek·shən]Gnomonic Projectioncentral projection, a map projection obtained by projecting the points of a sphere from its center to a tangent plane. The method was proposed by Thales of Miletus in the sixth century B.C. Of all the methods of projecting a sphere, only the gnomonic projection possesses the characteristic that all great circles of a sphere are represented on a plane by straight lines. In view of the considerable distortions in gnomonic projections, they are used chiefly for representing small sections of a sphere (in astronomy and navigation). |
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